Screw tap
By designing taps with a specific structure, the problems of high cutting force, part deformation and damage when tapping difficult-to-cut steel materials have been solved, achieving high-precision machining and low-cost production.
Patent Information
- Application Number
- CN202520451089.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-03-14
AI Technical Summary
When tapping difficult-to-machine steel materials, the existing taps bear a large cutting force on the cutting teeth, which leads to bulging of the outer diameter of the parts, large deformation, dimensional deviation, low productivity, and easy damage to the cutting teeth, thus increasing production costs.
A tap was designed, comprising a cutting part, a calibration part, and a shank connected sequentially along the axial direction. The outer peripheral wall of the cutting part is provided with cutting teeth and a first chip removal groove, and the outer peripheral wall of the calibration part is provided with calibration teeth and a second chip removal groove. The cutting teeth are connected to the calibration teeth. The radial dimension of the cutting part gradually increases, and the maximum radial dimension is equal to that of the calibration part. It is machined by powder metallurgy high-speed steel grinding and the surface is coated with a protective film.
It reduces the cutting force of the cutting teeth during the tapping process, protects the cutting teeth, improves machining accuracy and productivity, ensures the calibration effect of internal threads, and reduces production costs.
Smart Images
Figure CN223876227U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to machining tool technical field especially tap. BACKGROUND
[0002] The internal thread of the free cutting steel material product is usually processed by the internal thread forming tool. However, when the internal thread of the difficult cutting steel material such as S35C material is processed, the internal thread forming tool is damaged easily because the cutting performance of the difficult cutting steel material is poor, and the size of the internal thread processed by the internal thread forming tool is extremely unstable.
[0003] To solve the above problems, the internal thread processing method of S35C material is adjusted from the internal thread forming tool machining method to the tapping machining using the tap. However, the cutting force borne by the cutting tooth in the existing tap is large, which not only leads to the bulging of the part outer diameter after machining, the large deformation, the size out-of-tolerance of the part outer diameter, and the very low machining productivity, but also damages the cutting tooth in the tapping process, further increasing the production cost.
[0004] Therefore, it is urgent to invent a tap to solve the above problems. SUMMARY
[0005] The utility model discloses a tap, which realizes tapping of the internal thread, has high machining precision and good machining effect, reduces the cutting force borne by the cutting tooth in the tapping process, and improves the protection of the cutting tooth.
[0006] To achieve this purpose, the utility model adopts the following technical scheme:
[0007] The tap comprises a cutting portion, a calibration portion and a handle portion connected in sequence along an axial direction.
[0008] The cutting portion is provided with a cutting tooth and a first chip removal groove on an outer peripheral wall along the axial direction, the calibration portion is provided with a calibration tooth and a second chip removal groove on an outer peripheral wall along the axial direction, the cutting tooth is connected with the calibration tooth, and the first chip removal groove is connected with the second chip removal groove.
[0009] The radial dimension of the cutting portion gradually increases along the axial direction from one end away from the calibration portion to the direction close to the calibration portion, and the maximum radial dimension of the cutting portion is equal to the radial dimension of the calibration portion.
[0010] As an optional scheme, the radial dimension of the calibration portion gradually decreases along the axial direction from one end close to the cutting portion to the direction away from the cutting portion, and the maximum radial dimension of the cutting portion is equal to the maximum radial dimension of the calibration portion.
[0011] As an option, the cutting portion is provided with three cutting teeth and three first chip flutes along the peripheral wall in the axial direction, and one first chip flute is arranged between every two adjacent cutting teeth.
[0012] The calibration portion is provided with three calibration teeth and three second chip flutes along the peripheral wall in the axial direction, and one second chip flute is arranged between every two adjacent calibration teeth.
[0013] Each cutting tooth is connected with one calibration tooth, and each first chip flute is connected with one second chip flute.
[0014] As an option, the cutting tooth and the first chip flute extend in the axial direction while rotating around the circumference.
[0015] The calibration tooth and the second chip flute extend in the axial direction while rotating around the circumference.
[0016] As an option, the cutting portion is provided with an abutting section at one end thereof away from the calibration portion in the axial direction, and the abutting section is capable of abutting with an end surface of a part to be machined.
[0017] As an option, the shank portion comprises:
[0018] a connecting section extending in the axial direction, one end of the connecting section in the axial direction being connected with the calibration portion; and
[0019] a butt joint section connected with the other end of the connecting section in the axial direction, the butt joint section being configured to be butt jointed and fixed with a driving structure.
[0020] As an option, the butt joint section has a polygonal radial section.
[0021] As an option, the tap is formed by grinding using powder metallurgy high-speed steel.
[0022] As an option, the tap is coated with a protective film.
[0023] As an option, the ratio of the minimum radial dimension of the cutting portion to the maximum radial dimension of the cutting portion is not less than 0.7 and not more than 0.9.
[0024] The tap has the following beneficial effects:
[0025] The tap provided by the utility model, by setting the cutting part, the calibration part and the handle part connected in sequence along the axial direction, setting the cutting tooth and the first chip groove on the peripheral wall of the cutting part along the axial direction, and setting the calibration tooth and the second chip groove on the peripheral wall of the calibration part along the axial direction, the cutting tooth is connected with the calibration tooth, the first chip groove is connected with the second chip groove, the actual tapping requirement can be met, by making the radial dimension of the cutting part gradually increase along the axial direction from the end far away from the calibration part to the direction close to the calibration part, and ensuring that the maximum radial dimension of the cutting part is equal to the radial dimension of the calibration part, in the tapping process, with the cutting part continuously inserted into the machining hole along the axial direction, the progressive machining of the internal thread is realized, the cutting force on the cutting tooth can be reduced, the protection of the cutting tooth is improved, and the calibration effect of the calibration tooth on the machined internal thread can be ensured. BRIEF DESCRIPTION OF DRAWINGS
[0026] Figure 1 is the structure schematic diagram of the tap provided by the utility model embodiment;
[0027] Figure 2 is the local enlarged view of the cutting tooth provided by the utility model embodiment;
[0028] Figure 3 is the radial section schematic diagram of the cutting part provided by the utility model embodiment;
[0029] Figure 4 is the radial section schematic diagram of the butt joint section provided by the utility model embodiment.
[0030] In the drawing:
[0031] 100, tap; 110, cutting part; 111, cutting tooth; 112, first chip groove; 113, abutting section; 120, calibration part; 121, calibration tooth; 122, second chip groove; 130, handle part; 131, connecting section; 132, butt joint section. DETAILED DESCRIPTION
[0032] The utility model will be further explained in detail in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawing, not all structures.
[0033] In the description of the utility model, unless another definite provision and limitation, the term '' connected '' '' connection '' '' fixed '' should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated, can be mechanical connection, also can be electrical connection, can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two element's interaction relation. For ordinary skilled in the art, the above-mentioned term can be understood in the utility model with concrete meaning according to specific circumstances.
[0034] In the utility model, unless another definite provision and limitation, first feature is '' on '' or '' below '' second feature can include that first and second features are directly contacted, also can include that first and second features are not directly contacted but are contacted through additional features between them. Moreover, first feature is '' on '' '' above '' and '' on '' second feature includes that first feature is directly above and obliquely above second feature, or just indicates that the horizontal height of first feature is higher than second feature. First feature is '' below '' '' below '' and '' below '' second feature includes that first feature is directly below and obliquely below second feature, or just indicates that the horizontal height of first feature is less than second feature.
[0035] In the description of the embodiment, the term '' on '' '' below '' '' right '' etc. orientation or positional relationship is based on the orientation or positional relationship shown in the drawing, just for the convenience of description and simplification operation, and not indicate or imply that the device or element referred to must have a particular orientation, with a particular orientation configuration and operation, therefore can not be understood as the limitation of the utility model. In addition, the term '' first '' '' second '' is just used to distinguish in the description, and has no special meaning.
[0036] The internal thread of the free-cutting steel material product is usually machined by an internal thread forming tool. However, when machining the internal thread of the difficult-to-cut steel material such as S35C material, the internal thread forming tool is prone to be damaged due to the poor cutting performance of the difficult-to-cut steel material, and the size of the internal thread machined by the internal thread forming tool is extremely unstable. Therefore, the machining scheme of the internal thread of S325C material is adjusted from the machining method of the internal thread forming tool to the tapping machining using a tap. However, the cutting teeth in the existing tap bear a large cutting force, which not only causes the part to be deformed and the outer diameter of the part to be out of tolerance after machining, but also causes the cutting teeth to be damaged during tapping, thereby further increasing the production cost. Therefore, the machining method of the internal thread forming tool is adjusted to the tapping machining using a tap. However, the cutting teeth in the existing tap bear a large cutting force, which not only causes the part to be deformed and the outer diameter of the part to be out of tolerance after machining, but also causes the cutting teeth to be damaged during tapping, thereby further increasing the production cost.
[0037] To solve the above problems, as shown in Figure 1 The tap 100 comprises a cutting portion 110, a calibration portion 120 and a shank portion 130 connected in sequence along the axial direction, wherein the cutting portion 110 is provided with cutting teeth 111 and a first chip groove 112 on the outer peripheral wall along the axial direction, the calibration portion 120 is provided with calibration teeth 121 and a second chip groove 122 on the outer peripheral wall along the axial direction, the cutting teeth 111 are connected with the calibration teeth 121, and the first chip groove 112 is connected with the second chip groove 122, the radial dimension of the cutting portion 110 gradually increases along the axial direction from the end away from the calibration portion 120 to the direction close to the calibration portion 120, and the maximum radial dimension of the cutting portion 110 is equal to the radial dimension of the calibration portion 120.
[0038] The tap 100 comprises a cutting portion 110, a calibration portion 120 and a shank portion 130 connected in sequence along the axial direction, wherein the cutting portion 110 is provided with cutting teeth 111 and a first chip groove 112 on the outer peripheral wall along the axial direction, the calibration portion 120 is provided with calibration teeth 121 and a second chip groove 122 on the outer peripheral wall along the axial direction, the cutting teeth 111 are connected with the calibration teeth 121, and the first chip groove 112 is connected with the second chip groove 122, the radial dimension of the cutting portion 110 gradually increases along the axial direction from the end away from the calibration portion 120 to the direction close to the calibration portion 120, and the maximum radial dimension of the cutting portion 110 is equal to the radial dimension of the calibration portion 120.
[0039] It should be noted that, in the present embodiment, as shown in Figure 2 The tooth shape of the cutting tooth 111 is trapezoidal. The tooth shape of the calibration tooth 121 is the same as that of the cutting tooth 111, and the tooth shape of the calibration tooth 121 is also trapezoidal. In other embodiments, the tooth shapes of the cutting tooth 111 and the calibration tooth 121 can be adjusted according to actual needs, as long as the tooth shapes of the cutting tooth 111 and the calibration tooth 121 are the same, and the present embodiment is not limited in this regard. In addition, the specific structure and setting angle of the cutting edge in the cutting tooth 111 are set according to the prior art, and the specific structure of the cutting edge will not be described here.
[0040] Alternatively, the ratio of the minimum radial dimension of the cutting portion 110 to the maximum radial dimension of the cutting portion 110 is not less than 0.7 and not greater than 0.9, so as to ensure that the cutting portion 110 can be normally tapped along the axial direction away from the one end of the calibration portion 120. It should be noted that in the embodiment, the maximum radial dimension of the cutting portion 110 is 8.26 mm, the minimum radial dimension of the cutting portion 110 is 6.6 mm, and the ratio of the minimum radial dimension of the cutting portion 110 to the maximum radial dimension of the cutting portion 110 is approximately 0.8. In the embodiment, the axial length of the cutting portion 110 is 66 mm, and the axial length of the tap 100 is 155 mm, so as to sufficiently extend the axial length of the cutting portion 110 and reduce the cutting force on the cutting teeth 111 during work. In other embodiments, the ratio of the minimum radial dimension of the cutting portion 110 to the maximum radial dimension of the cutting portion 110 can be adjusted according to actual needs, and the axial length of the cutting portion 110 can be adaptively adjusted, which is not specifically limited in the embodiment.
[0041] In the embodiment, the radial dimension of the calibration portion 120 gradually decreases along the axial direction from the one end close to the cutting portion 110 to the direction away from the cutting portion 110, and the maximum radial dimension of the cutting portion 110 is equal to the maximum radial dimension of the calibration portion 120. By gradually decreasing the radial dimension of the calibration portion 120 along the axial direction from the one end close to the cutting portion 110 to the direction away from the cutting portion 110, and ensuring that the maximum radial dimension of the cutting portion 110 is equal to the maximum radial dimension of the calibration portion 120, a reverse taper extending along the axial direction from the one end close to the cutting portion 110 to the direction away from the cutting portion 110 can be formed on the calibration portion 120, the friction between the calibration teeth 121 and the wall of the machined thread hole during tapping is reduced, and excessive extrusion or scratching of the thread is avoided.
[0042] As Figure 1 and Figure 3As shown, the cutting part 110 is provided with three cutting teeth 111 and three first chip grooves 112 along the axial outer peripheral wall, and one first chip groove 112 is arranged between each two adjacent cutting teeth 111. The calibration part 120 is provided with three calibration teeth 121 and three second chip grooves 122 along the axial outer peripheral wall, and one second chip groove 122 is arranged between each two adjacent calibration teeth 121. Each cutting tooth 111 is connected with one calibration tooth 121, and each first chip groove 112 is connected with one second chip groove 122. By arranging three cutting teeth 111 and three first chip grooves 112 along the axial outer peripheral wall of the cutting part 110, and arranging three calibration teeth 121 and second chip grooves 122 along the axial outer peripheral wall of the calibration part 120, each cutting tooth 111 is connected with one calibration tooth 121, and each first chip groove 112 is connected with one second chip groove 122, so that the tapping efficiency of the tap 100 is improved. By arranging one first chip groove 112 between each two adjacent cutting teeth 111 and one second chip groove 122 between each two adjacent calibration teeth 121, the cutting teeth 111 and the calibration teeth 121 can quickly discharge the waste chips along the first chip grooves 112 and the second chip grooves 122, so as to ensure the tapping effect.
[0043] In addition, in order to further improve the chip removal effect of the first chip groove 112 and the second chip groove 122, the cutting tooth 111 and the first chip groove 112 extend along the axial direction while rotating around the circumferential direction, and the calibration tooth 121 and the second chip groove 122 extend along the axial direction while rotating around the circumferential direction, so that the cutting tooth 111 and the first chip groove 112 are arranged in a spiral shape on the axial outer peripheral wall of the cutting part 110, and the calibration tooth 121 and the second chip groove 122 are arranged in a spiral shape on the axial outer peripheral wall of the calibration part 120.
[0044] In the actual machining process, when the tap 100 is used to tap the hole to be machined in the part to be machined, the front end of the tap 100, i.e. the end of the cutting part 110 away from the calibration part 120, needs to be first connected with the hole to be machined. At this time, the front end of the tap 100 inevitably abuts against the end face of the part to be machined. In order to improve the protection of the cutting tooth 111 and facilitate the connection of the tap 100 with the hole to be machined in the part to be machined, as shown, the end of the cutting part 110 away from the calibration part 120 is provided with an abutting section 113, which can abut against the end face of the part to be machined. Figure 1
[0045] In one alternative embodiment, the handle 130 includes a connecting segment 131 and a mating segment 132. The connecting segment 131 extends axially, with one axial end connected to the calibration unit 120, and the mating segment 132 connected to the other axial end of the connecting segment 131. The mating segment 132 is configured to be fixedly mated to the drive structure. By dividing the handle 130 into the connecting segment 131 and the mating segment 132, and connecting the two axial ends of the connecting segment 131 to the calibration unit 120 and the mating segment 132 respectively, and fixing the mating segment 132 to the drive structure, the drive structure and the calibration unit 120 can be axially isolated, avoiding unnecessary contact.
[0046] To improve the docking effect between the docking segment 132 and the driving structure, the radial cross-section of the docking segment 132 is polygonal. It should be noted that, in this embodiment, as... Figure 4 As shown, the radial cross-section of the docking segment 132 is rectangular. When the docking segment 132 docks with the driving structure, it can prevent slippage around the axial direction between the docking segment 132 and the driving structure. In other embodiments, the radial cross-section of the docking segment 132 can also be triangular, pentagonal, or a polygon with any number of sides; this embodiment does not impose specific limitations.
[0047] In this embodiment, the tap 100 is formed by grinding powder metallurgy high-speed steel. By using powder metallurgy high-speed steel as raw material and grinding to manufacture the tap 100, the structural strength of the cutting teeth 111 and the calibrating teeth 121 can be guaranteed, thereby ensuring the tapping effect of the tap 100.
[0048] Furthermore, in this embodiment, the surface of the tap 100 is coated with a protective film. Specifically, the protective film is a titanium layer, and the tap 100 undergoes a surface plating treatment to coat its surface with a titanium layer, thereby improving the surface wear resistance, corrosion resistance, and oxidation resistance of the tap 100. In other embodiments, the specific type of protective film can be adjusted according to actual needs; this embodiment does not impose specific limitations.
[0049] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A tap, characterized in that The cutting part (110), the calibration part (120) and the handle part (130) are connected in sequence along the axial direction; The cutting part (110) is provided with cutting teeth (111) and first chip grooves (112) on the outer peripheral wall along the axial direction, the calibration part (120) is provided with calibration teeth (121) and second chip grooves (122) on the outer peripheral wall along the axial direction, the cutting teeth (111) are connected with the calibration teeth (121), and the first chip grooves (112) are connected with the second chip grooves (122). The radial dimension of the cutting part (110) gradually increases along the axial direction from one end away from the calibration part (120) to the direction close to the calibration part (120), and the maximum radial dimension of the cutting part (110) is equal to the radial dimension of the calibration part (120).
2. The tap of claim 1 wherein, The radial dimension of the calibration part (120) gradually decreases along the axial direction from one end close to the cutting part (110) to the direction away from the cutting part (110), and the maximum radial dimension of the calibration part (120) is equal to the maximum radial dimension of the cutting part (110).
3. The tap of claim 1 wherein, The cutting part (110) is provided with three cutting teeth (111) and three first chip grooves (112) on the outer peripheral wall along the axial direction, and one first chip groove (112) is arranged between every two adjacent cutting teeth (111). The calibration part (120) is provided with three calibration teeth (121) and three second chip grooves (122) on the outer peripheral wall along the axial direction, and one second chip groove (122) is arranged between every two adjacent calibration teeth (121). Each cutting tooth (111) is connected with one calibration tooth (121), and each first chip groove (112) is connected with one second chip groove (122).
4. The tap of claim 1 wherein, The cutting tooth (111) and the first chip groove (112) extend along the axial direction while rotating around the circumference. The calibration tooth (121) and the second chip groove (122) extend along the axial direction while rotating around the circumference.
5. The tap of claim 1 wherein, The cutting part (110) is provided with an abutting section (113) at one end away from the calibration part (120) along the axial direction, and the abutting section (113) can abut against the end face of the part to be machined.
6. The tap of claim 1 wherein, The handle part (130) comprises: a connecting section (131) extending along the axial direction, one end of the connecting section (131) being connected with the calibration part (120); and a butt joint section (132) connected with the other end of the connecting section (131), the butt joint section (132) being configured to be butt-jointed and fixed with the driving structure.
7. The tap of claim 6 wherein, The radial section of the butt joint section (132) is a polygon.
8. The tap of claim 1 wherein, The tap is formed by grinding with powder metallurgy high-speed steel.
9. The tap of claim 1 wherein, The surface of the tap is coated with a protective film.
10. The tap of claim 1 wherein, The ratio of the minimum radial dimension of the cutting part (110) to the maximum radial dimension of the cutting part (110) is not less than 0.7 and not greater than 0.9.